/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package com.rmatos.course.practices.web.primes.servlet;

import com.rmatos.course.practices.web.primes.backend.PrimesCalculator;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author rmatos
 */
@WebServlet(name="PrimesNumber", urlPatterns={"/PrimesNumber"})
public class PrimesNumber extends HttpServlet {

    private PrimesCalculator calculator = new PrimesCalculator();
    private RequestDispatcher dispatcher;

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {

        try{

        String number = request.getParameter("limit");

        calculator.setLimit(number);
        ArrayList<Integer> results = calculator.getPrimesNumbers();
        request.setAttribute("results", results);

        dispatcher = request.getRequestDispatcher("primes/primesResults.jsp");
        dispatcher.forward(request, response);

        }catch(Exception e){

            String errorMessage = e.getMessage();

            request.setAttribute("errorMessage", errorMessage);

            dispatcher = request.getRequestDispatcher("primes/servletError.jsp");
            dispatcher.forward(request, response);


        }



    } 

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    } 

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}
